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Doctoral Thesis
DOI
10.11606/T.18.2011.tde-08022012-104315
Document
Author
Full name
Flávia Bottino
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2011
Supervisor
Committee
Calijuri, Maria do Carmo (President)
Benassi, Roseli Frederigi
Bianchini Junior, Irineu
Camargo, Antonio Fernando Monteiro
Santos, André Cordeiro Alves dos
Title in Portuguese
Diversidade, biomassa e decomposição de macrófitas aquáticas no Reservatório Itupararanga - SP
Keywords in Portuguese
Biomassa
Decomposição
Macrófitas aquáticas
Reservatório Itupararanga
Abstract in Portuguese
A presença de macrófitas em reservatórios possui tanto aspectos positivos como negativos para os ecossistemas aquáticos tornando-se, assim, essencial o estudo dessa comunidade para o adequado manejo dos recursos hídricos. O principal objetivo do presente estudo foi verificar a variação sazonal das características limnológicas do reservatório Itupararanga-SP e relacioná-las com a variação da biomassa de macrófitas e com a taxa de decomposição dessas plantas. Sendo assim, selecionaram-se quatro braços no reservatório, com presença relevante de macrófitas. Amostras de água e sedimento foram coletadas sazonalmente e analisadas. Nos mesmos períodos as plantas foram amostradas e a biomassa determinada. Avaliou-se ainda, a decomposição in situ e em laboratório de duas espécies (Polygonum lapathifolium e Eichhornia azurea) com o intuito de comparar as taxas de decomposição sob condições naturais e controladas. Empregou-se um modelo cinético para obtenção dos coeficientes de decaimento de massa. Os resultados obtidos foram analisados estatisticamente através do teste ANOVA e Análise de Correspondência Canônica (CCA). As análises limnológicas revelaram a formação de um gradiente espaço-temporal no reservatório que provavelmente influenciou a distribuição e o desenvolvimento da biomassa nas diferentes estações de amostragem. Verificou-se que Eichhornia crassipes e Pistia stratiotes foram influenciadas pela concentração de nutrientes. A CCA evidenciou a relação entre Polygonum lapathifolium, pH, oxigênio dissolvido, matéria orgânica e nutrientes no sedimento, enquanto Eichhornia azurea e Myriophyllum aquaticum foram influenciados, de forma diferente, por compostos inorgânicos. O processo de decomposição foi mais rápido em condições naturais, tanto para E. azurea como para P. lapathifolium, com maior mineralização da matéria orgânica particulada e refratária. Sob condições controladas, o decaimento da matéria orgânica dissolvida foi mais lento em temperaturas mais baixas e o coeficiente Q10 indicou que o incremento da temperatura interferiu no decaimento de massa. Esse fato ficou mais evidente nos resultados obtidos para E. azurea. A decomposição revelou elevada quantidade de matéria orgânica refratária em ambas as espécies, as quais contribuem ao aporte de carbono com, aproximadamente 200g de carbono de refratário.
Title in English
Diversity, biomass and decomposition of aquatic macrophytes in Itupararanga Reservoir - São Paulo
Keywords in English
Aquatic macrophytes
Biomass
Decomposition
Itupararanga Reservoir
Abstract in English
The occurrence of aquatic macrophytes in reservoirs plays positive and negative effects to aquatic ecosystems, therefore the study of macrophyte community is essential to the aquatic resources management. This study aimed to evaluate the seasonal variation of limnological conditions of Itupararanga Reservoir, Sao Paulo State, to associate them with macrophyte biomass and with the decomposition rates of the plants. So four arms in the reservoir, where the presence of macrophytes was relevant, were selected to perform this study. Water and sediment along with macrophytes were sampled in different seasons and analyzed. Decomposition experiments of two macrophyte species (Polygonum lapathifolium and Eichhornia azurea) were carried out in situ and in laboratory conditions in order to compare the decomposition rates in different conditions. A kinetic model was adopted to explain the organic matter decay. The results were statistically analyzed with ANOVA and Canonical Correspondence Analyses (CCA). The limnological results showed a spatial and temporal variation which probably influenced the distribution and development of macrophyte biomass. The nutrient concentration influenced Eichhornia crassipes and Pistia stratiotes. Moreover the CCA showed a relationship among Polygonum lapathifolium, pH, dissolved oxygen, sediment organic matter and sediment nutrients, while Eichhornia azurea and Myriophyllum aquaticum were associated in different way with inorganic compounds. The decomposition process was faster in natural conditions with high mineralization coefficient for both E. azurea and P. lapathifolium. Under laboratory conditions the dissolved organic matter decay was slower for low temperatures and Q10 coefficient showed the temperature interference in the mass breakdown mainly for E. azurea assay. Both species have high refractory contents, which contributes, approximately, with 200g of refractory carbon.
 
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Publishing Date
2012-02-17
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Bottino, Flávia, Calijuri, Maria do Carmo, and MURPHY, KEVIN JOSEPH. Organic matter cycling in a neotropical reservoir: effects of temperature and experimental conditions [doi:10.1590/S2179-975X2013000200010]. Acta Limnologica Brasiliensia [online], 2013, vol. 25, p. 192-201.
  • Bottino, Flávia, Calijuri, Maria do Carmo, and MURPHY, KEVIN JOSEPH. Temporal and spatial variation of limnological variables and biomass of different macrophyte species in a Neotropical reservoir (São Paulo - Brazil) [doi:10.1590/S2179-975X2013000400004]. Acta Limnologica Brasiliensia [online], 2013, vol. 25, p. 387-397.
  • CUNHA, Davi Gasparini Fernandes, Bottino, Flávia, and do Carmo Calijuri, Maria. Can free-floating and emerged macrophytes influence the density and diversity of phytoplankton in subtropical reservoirs? [doi:10.1080/07438141.2012.724520]. Lake and Reservoir Management [online], 2012, vol. 28, p. 121015103955001-264.
  • Bottino, Flávia, et al. Calibration of QUAL2K model in brazilian micro watershed: effects of the land use on water quality [doi:10.4322/actalb.2011.011]. Acta Limnologica Brasiliensia [online], 2010, vol. 22, p. 474-485.
  • CUNHA, Davi Gasparini Fernandes, Bottino, F., e Calijuri, Maria do C. Land use influence on eutrophication-related water variables: case study of tropical rivers with differrent degrees of anthropogenic interference. Acta Limnologica Brasiliensia, 2010, vol. 22, p. 35-45.
  • TANIWAKI, R. H., et al. Structure and dynamics of the community of periphytic algae in a subtropical reservoir (state of São Paulo, Brazil). Acta Botanica Brasilica, 2013, vol. 27, p. 551-559.
  • Bottino, F., et al. Aquatic macrophytes in a brazilian oligo-mesotrophic reservoir: Eicchornia sp decomposition. In IWA World Water Congress and Exhibition, Montreal, 2010. Proceedings of IWA World Water Congress and Exhibition.Montreal : Editorial Manager for IWA Conferences, 2010.
  • Bottino, F., et al. Influence of hydrological regime and land use in total nitrogen loads of Canha River, São Paulo, Brazil. In 2nd International Multidisciplinary Conference on Hydrology and Ecology (HydroEco 2009), Viena, 2009. Anais 2nd International Multidisciplinary Conference on Hydrology and Ecology (HydroEco 2009).Viena : Bruthans-Kovar-Nachtnebel, 2009. Abstract.
  • CUNHA, Davi Gasparini Fernandes, et al. Seasonal behavior of eutrophication-related water variables: the case of a tropical mesotrophic reservoir in Brazil. In IWA World Water Congress and Exhibition, Montreal, 2010. Proceedings of IWA World Water Congress and Exhibition.Montreal : Editorial for IWA Conference, 2010.
  • MIWA, Adriana C P, et al. Phytoplanktonic primary production seasonal fluctuation: the case of an oligo-mesotrophic multi-purpose reservoir in Brazil. In IWA World Water Congress and Exhibition, Montreal, 2010. Proceedings of IWA World Water Congress and Enhibition.Montreal : Editorial Manager for IWA Conferences, 2010. Resumo.
  • MIWA, Adriana Cristina Poli, et al. Limnologia do reservatório de Itupararanga. In Beu, S. E., Dos Santos, A. C. A., e Casali, S. Biodiversidade na APA de Itupararanga: Condições Atuais e Perspectivas Futuras. Organizador. São Manuel : Grafilar, 2011{Volume}. cap. 1, p. 65-71.http://www.teses.usp.br/teses/disponiveis/18/18138/tde-08022012-104315/
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